There are several things to check if your Calendar or Task reminders do not appear.

First, make sure that the reminders are enabled. To do this:

  • In Outlook 2007, go to Tools > Options > Other > Advanced Options > Reminder Options. Make sure the Display the Reminder option is selected.
  • In Outlook 2010/2013/2016/2019, go to File > Options > Advanced and find the Reminders section. Make sure the Show Reminders option is selected.
    Reminders

Note: Reminders do not appear on top of other windows when Outlook is running in the background (minimized).

If you're using Office 365 Home, Office 365 Personal, Office 365 Business, and Office 365 ProPlus on Monthly Channel (Version 1803 or newer) then you may also see "Show reminders on top of other windows" option. For subscription customers on one of the Semi-Annual Channels, this option will become available after upgrading to Version 1808. Read the Knowledge Base article on What Is The Version Of My Outlook Client? to check your Outlook version.

If "Show reminders" field was already checked, then proceed with the steps below.

Important: We recommend backing up your Outlook data first. Read the Knowledge Base article on  for details on backing up your data.

  1. Once you have your data backed up, close Outlook. Then click Start > Run, and type in:
    outlook.exe /cleanreminders
    and press Enter or click OK.
    All of the reminders that you have missed should start to appear on your screen. If they do not, create a test task or calendar appointment to see if you are prompted with a reminder. If you do not get prompted with a reminder, continue on to step 2.
    Clean reminders
  2. Close Outlook, then click Start > Run, and type in:
    outlook.exe /resetfolders
    and press Enter or click OK.
    All of the reminders that you have missed should start to appear on your screen now.
  3. Close Outlook. Then click Start > Run, and type in:
    outlook.exe /cleanfreebusy
    and press Enter or click OK.

    Note: This command is no longer supported and works only for Outlook 2010, Outlook 2007 and earlier versions.

    All of the reminders that you have missed should start to appear on your screen. If they do not, create a test task or calendar appointment to see if you are prompted with a reminder. If you do not get prompted with a reminder, continue on to step 3.